Question

a) 5a+2b+c,pa=2,b=1 e c=7

b) 4a+2b-c,p/a=1,b=3 e c =5

c) 2x-5y,p/x1=ey=2

Answer 1

a)
5a + 2b + c,
p/ a = 2, b = 1 e c = 7

= 5.2 + 2.1 + 7
= 10 + 2 + 7
= 12 + 7
= 19
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b)
4a + 2b - c,
p/ a = 1,b = 3 e c = 5

= 4.1 + 2.3 - 5
= 4 + 6 - 5
= 4 + 1
= 5
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c)
2x - 5y
p/ x = 1 e y = 2

= 2.1 - 5.2
= 2 - 10
= - 8